VuoTelemetry.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "VuoTelemetry.h"
 
char * vuoCopyStringFromMessage(zmq_msg_t *message)
{
    size_t messageSize = zmq_msg_size(message);
    if (!messageSize)
        return NULL;
    char *string = (char *)malloc(messageSize);
    memcpy(string, zmq_msg_data(message), messageSize);
    return string;
}
 
void vuoInitMessageWithString(zmq_msg_t *message, const char *string)
{
    size_t messageSize = (string != NULL ? (strlen(string) + 1) : 0);
    zmq_msg_init_size(message, messageSize);
    memcpy(zmq_msg_data(message), string, messageSize);
}
 
void vuoInitMessageWithInt(zmq_msg_t *message, int value)
{
    size_t messageSize = sizeof(int);
    zmq_msg_init_size(message, messageSize);
    memcpy(zmq_msg_data(message), &value, messageSize);
}
 
void vuoInitMessageWithBool(zmq_msg_t *message, bool value)
{
    size_t messageSize = sizeof(bool);
    zmq_msg_init_size(message, messageSize);
    memcpy(zmq_msg_data(message), &value, messageSize);
}
 
bool VuoTelemetry_hasMoreToReceive(void *socket)
{
    int more;
    size_t moreSize = sizeof more;
    zmq_getsockopt(socket, ZMQ_RCVMORE, &more, &moreSize);
    return more;
}
 
char * vuoReceiveAndCopyString(void *socket, char **error)
{
    zmq_msg_t message;
    zmq_msg_init(&message);
 
    if (zmq_msg_recv(&message, socket, 0) == -1)
    {
        int e = errno;
        char *errorMessage;
        if (e == EAGAIN)
            errorMessage = strdup("The connection between the composition and runner timed out when trying to receive a message");
        else
        {
            const char *eStr = zmq_strerror(e);
            const char *format = "The connection between the composition and runner failed when trying to receive a message (%s)";
            int size = snprintf(NULL, 0, format, eStr);
            errorMessage = malloc(size+1);
            snprintf(errorMessage, size+1, format, eStr);
        }
        if (error)
            *error = errorMessage;
        else
        {
            VUserLog("%s", errorMessage);
            free(errorMessage);
        }
        zmq_msg_close(&message);
        return NULL;
    }
 
    char *string = vuoCopyStringFromMessage(&message);
    zmq_msg_close(&message);
    return string;
}
 
void vuoReceiveBlocking(void *socket, void *data, size_t dataSize, char **error)
{
    zmq_msg_t message;
    zmq_msg_init(&message);
 
    if (zmq_msg_recv(&message, socket, 0) == -1)
    {
        int e = errno;
        char *errorMessage;
        if (e == EAGAIN)
            errorMessage = strdup("The connection between the composition and runner timed out when trying to receive a message");
        else if (e == ETERM)
            errorMessage = strdup("The connection between the composition and runner failed because the context was terminated when trying to receive a message");
        else
        {
            const char *eStr = zmq_strerror(e);
            const char *format = "The connection between the composition and runner failed when trying to receive a message (%s)";
            int size = snprintf(NULL, 0, format, eStr);
            errorMessage = malloc(size+1);
            snprintf(errorMessage, size+1, format, eStr);
        }
        if (error)
            *error = errorMessage;
        else
        {
            VUserLog("%s", errorMessage);
            free(errorMessage);
        }
        zmq_msg_close(&message);
        bzero(data, dataSize);
        return;
    }
 
    size_t messageSize = zmq_msg_size(&message);
    if (messageSize != dataSize)
    {
        const char *format = "A wrong-sized message was received in the connection between the composition and runner "
                             "(expected %lu bytes, received %lu bytes)";
        int size = snprintf(NULL, 0, format, (unsigned long)dataSize, (unsigned long)messageSize);
        char *errorMessage = malloc(size+1);
        snprintf(errorMessage, size+1, format, (unsigned long)dataSize, (unsigned long)messageSize);
        if (error)
            *error = errorMessage;
        else
        {
            VUserLog("%s", errorMessage);
            free(errorMessage);
        }
        zmq_msg_close(&message);
        bzero(data, dataSize);
        return;
    }
 
    memcpy(data, zmq_msg_data(&message), messageSize);
    zmq_msg_close(&message);
}
 
unsigned long vuoReceiveUnsignedInt64(void *socket, char **error)
{
    uint64_t number = 0;
    vuoReceiveBlocking(socket, (void *)&number, sizeof(number), error);
    return number;
}
 
int vuoReceiveInt(void *socket, char **error)
{
    int number = 0;
    vuoReceiveBlocking(socket, (void *)&number, sizeof(number), error);
    return number;
}
 
bool vuoReceiveBool(void *socket, char **error)
{
    bool value = false;
    vuoReceiveBlocking(socket, (void *)&value, sizeof(value), error);
    return value;
}
 
void vuoSend(const char *name, void *socket, int type, zmq_msg_t *messages, unsigned int messageCount, bool isNonBlocking, char **error)
{
    int e = 0;
 
    // send the type message-part
    {
        zmq_msg_t message;
        zmq_msg_init_size(&message, sizeof type);
        memcpy(zmq_msg_data(&message), &type, sizeof type);
        int flags = (messageCount > 0 ? ZMQ_SNDMORE : 0) | (isNonBlocking ? ZMQ_DONTWAIT : 0);
        if (zmq_msg_send(&message, socket, flags) == -1)
            e = errno;
        zmq_msg_close(&message);
    }
 
    // send the data message-parts
    for(unsigned int i=0; i<messageCount && e==0; ++i)
    {
        int flags = (i < messageCount - 1 ? ZMQ_SNDMORE : 0) | (isNonBlocking ? ZMQ_DONTWAIT : 0);
        if (zmq_msg_send(&messages[i], socket, flags) == -1)
            e = errno;
    }
 
    for(unsigned int i=0; i<messageCount; ++i)
        zmq_msg_close(&messages[i]);
 
    if (e != 0)
    {
        char *errorMessage;
        if (e == EAGAIN)
        {
            const char *format = "The connection between the composition and runner timed out when trying to send a message of type %i on '%s'";
            int size = snprintf(NULL, 0, format, type, name);
            errorMessage = malloc(size+1);
            snprintf(errorMessage, size+1, format, type, name);
        }
        else
        {
            const char *eStr = zmq_strerror(e);
            const char *format = "The connection between the composition and runner failed when trying to send a message of type %i on '%s' (%s)";
            int size = snprintf(NULL, 0, format, type, name, eStr);
            errorMessage = malloc(size+1);
            snprintf(errorMessage, size+1, format, type, name, eStr);
        }
        if (error)
            *error = errorMessage;
        else
        {
            VUserLog("%s", errorMessage);
            free(errorMessage);
        }
    }
}
 
#include <libkern/OSAtomic.h>
void vuoMemoryBarrier(void)
{
    OSMemoryBarrier();
}